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Research Papers

Thermal Performance of Biomass-Fired Steam Power Plant

[+] Author and Article Information
Chaouki Ghenai

Sustainable and Renewable Energy
Engineering Department,
College of Engineering,
University of Sharjah,
P.O. Box 27272,
Sharjah, United Arab Emirates
e-mail: cghenai@sharjah.ac.ae

Ahmed Amine Hachicha

Sustainable and Renewable Energy
Engineering Department,
College of Engineering,
University of Sharjah,
P.O. Box 27272,
Sharjah, United Arab Emirates
e-mail: ahachicha@sharjah.ac.ae

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received May 13, 2016; final manuscript received September 15, 2016; published online March 21, 2017. Assoc. Editor: Ziad Saghir.

J. Thermal Sci. Eng. Appl 9(3), 031002 (Mar 21, 2017) (8 pages) Paper No: TSEA-16-1126; doi: 10.1115/1.4035926 History: Received May 13, 2016; Revised September 15, 2016

This paper presents results on the performance of 10 MW biomass-fired steam power plant. The main objective is to test the performance of the power plant using different type of biomass fuels: bagasse, corn stover, forest residues, and urban wood residues. The biomass fuel was mixed with sub-bituminous coal with fractions of 0–100%. The effect of excess combustion air, flue gas temperature, and the parasitic loads on the power plant performance was investigated. The output results from the heat and mass balance analysis include the monthly and annual electrical power generated, capacity factor (CF), boiler efficiency (BE), thermal efficiency, and gross and net heat rate. The results show a slightly decrease (1.7%) of the annual energy production when the biomass fractions increase from 6% to 100% but a substantial decrease of the CO2 equivalent emissions. A decrease of the excess combustion air from 25% to 5% will increase the boiler and thermal efficiencies and the annual energy output by 2%. This is mainly due to the reduction of the dry flue gas losses (DFGLs) with the reduction of the excess combustion air. A reduction of the parasitic loads from 10% to 2% will increase the power plant performance by 9%. This can be achieved by using more efficient pumps, fans, and conveyors in the power plant. A reduction of the flue gas temperature from 480 °F to 360 °F increases the power plant performance by 4.4% due to the reduction of the dry flue gas losses.

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Figures

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Fig. 1

Schematic of biomass-fired power plant

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Fig. 2

Biomass-fired power plant performance modeling

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Fig. 3

Annual average dry and wet bulb temperatures and relative humidity

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Fig. 4

Monthly energy (kWh) output from the biomass-fired power plant

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Fig. 8

Effect of parasitic load on the annual energy production, capacity factor, and thermal efficiency of the biomass power plant

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Fig. 9

Effect of flue gas temperature on the annual energy, heat rate, and thermal efficiency of the biomass power plant

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Fig. 7

Effect of excess air on the annual energy production, thermal efficiency, and gross heat rate

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Fig. 6

Variation of the thermal efficiency and capacity factor of the biomass power plant with biomass fraction (thermal basis)

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Fig. 5

Variation of the annual energy (kWh) and life cycle CO2 equivalent (g CO2/lb dry biomass) of the biomass-fired power plant

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